Segmentation Error while drawing in TPad

Dear Experts,

I am trying to draw a histogram in the bottom panel of the canvas but I am not able to do it. However, when I draw the pulls in the same panel, I am able to draw. Will you please have alook. I ma using root 6.28. Here’s my working directory: (610.1 KB)

As it is a Roofit issue I guess @jonas can help

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